Mohammed Nawi, A.; Mohd Ishak, M. F.; Noor Hassim, N. H.; Jaan Jaafari, S.; Mohd Ghazali, Q.; Hassan, M. R.; Ahmad, N. Smartphone Apps As a Technological Innovation for Weight Reduction: A Systematic Review & Meta-Analysis. Int. J. Pub. Health Res. 2021, 11.